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It allows the exhaust to cut out right behind the cats. They move on an actuator system (this allows you to hit a button in the car and open and close them) the result is that it is wicked loud when full open WOT. You can look up some videos but I can tell you that they do it no justice. THEY'RE AWSOME
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TSP 2'' headers W/ hi Flo cats, CAI intake w/ apex scoop and wash relocate kit, VMAX TB, RX catch can, PFADT sways, NOWEEDS
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